Provide comfort and calming sensations wherever your cat goes. The pheromones in the Good Behavior collar mimic the natural pheromones emitted by mother cats to reassure and calm their kittens. Cats recognize these pheromones throughout their life as a source of comfort. The natural calming response can modify stress related behavior such as separation anxiety, excessive meowing, destructive behavior and inappropriate marking. Pheromones are released over 4 weeks. Fits up to 15" neck.